Transformers: The Last Knight is coming to Blu-ray and DVD on September 26th, and we had the chance to chat with iconic voice actors Peter Cullen and Frank Welker, the voice actors behind Optimus Prime and Megatron, respectively.

Cullen talks about how he had to change his Optimus Prime voice from the classic animated TV series to the film version.

Cullen tells Nerd Reactor, “The movie comes along, and Michael Bay said to me, ‘Peter, you’re going to be 45-feet tall.’ So we were in an airplane hangar, and they have a picture of Optimus Prime on top of a crane, so all the actors could relate to where the voice was coming from. ‘Can you make it bigger?’ Because the character is very big. I said, ‘Well, he’s going to sound pretty much the way he sounded.’ And then I thought about it, you know? I saw this mockup and went, ‘No, it has to be lower. It had to be deeper.'”

Frank Welker returns as the voice of Megatron, but he didn’t get the chance to voice the Decepticon leader in all the films.

In addition, you can check out my attempt at voicing Megatron inside the ADR booth at Paramount Studios.

Transformers: The Last Knight synopsis – Humans are at war with the Transformers, and Optimus Prime is gone. The key to saving the future lies buried in the secrets of the past and the hidden history of Transformers on Earth. Now, it’s up to the unlikely alliance of inventor Cade Yeager, Bumblebee, an English lord and an Oxford professor to save the world.